MO1L —  Invited Plenary   (28-Aug-23   08:30—10:30)
Chair: R. Ganter, PSI, Villigen PSI, Switzerland
Paper Title Page
MO1L1
 EuPRAXIA: The First FEL User Facility Driven by a Plasma Accelerator  
 
  • R.W. Aßmann
    DESY, Hamburg, Germany
  
  Funding: Supported by the European Union’s Horizon Europe research and innovation programme under grant agreement No. 101079773 and 101073480, the Swiss government and the UKRI guarantee funds.
The European Plasma Accelerator with eXcellence In Applications (EuPRAXIA) infrastructure* was proposed in 2014 and started its design phase in 2015 with an EU funded Design Study. By the end of 2019 the World‘s first conceptual design report (CDR) for a plasma-based user facility was completed. The EuPRAXIA CDR** describes the design of a compact and innovative research infrastructure that delivers ultra-short pulses of up to 5 GeV electrons, positrons, X-rays, FEL light and laser pulses to users from various fields. The project received government support from various European contries and was placed on the ESFRI roadmap of high priority European research infrastructures at end of 2021. The EuPRAXIA headquarters and one of the two construction sites is located at Frascati, Rome, in Italy. The second site will be decided among candidates in Czech Republic, Italy, Spain and UK. Presently several projects, supported by national and EU funds, are ongoing towards the implementation of this new research infrastructure. The talk will present the concept, user cases, the technical status, including successful FEL lasing***, the potential and challenges for EuPRAXIA.
* https://www.eupraxia-facility.org/
** R.W. Assmann et al., Eur. Phys. J. Special Topics 229, 3675-4284 (2020).
*** R. Pompili et al. Nature 605 (2022) 7911, 659-662. 		 
slides icon Slides MO1L1 [21.766 MB]  
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MO1L2
 Free-electron Light Interactions in Nanophotonics  
 
  • C. Roques-Carmes
    Stanford University, Stanford, California, USA
  
  Nanophotonics has become over the past decades a paramount technology, enabling, among other things, the design of novel light sources, detectors, and devices controlling the polarization, spectral, and angular distribution of light. A landmark of nanophotonics is the design of nanostructured materials (metasurfaces, photonic crystals, nanoresonators, etc.) to tailor the interaction of light with matter, either by shaping light propagation at the nanoscale, or by controlling emission from atoms and molecules. In this talk, I will show how one can enhance and tailor radiation from high-energy particles, such as free electrons and x-rays with engineered nanophotonics structures. I will present a framework to model, tailor, enhance, and even optimize radiation from free electrons and other high-energy particles interacting with nanophotonic structures. I will then describe the building of a featured experimental setup to record spectrally-resolved light emission from free electrons interacting with nanophotonic structures. I will focus on the example of nanophotonic flatbands in photonic crystals, which can be used to enhance free-electron radiation and acceleration by orders of magnitude by overcoming phase-matching limitations. I will utilize our methods to demonstrate nanophotonic enhancement of coherent cathodoluminescence from free electrons and discuss new frontiers in the quantum optics of free electrons  
slides icon Slides MO1L2 [13.704 MB]  
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MO1L3
 Production and Characterization of Hard X-rays Beyond 25 keV  
 
  • Y. Chen, T. Long
    DESY, Hamburg, Germany
  
  Dedicated R&D programs, aimed for delivering ultra-hard X-rays beyond 25 keV for advanced user experiments, have been launched at the European XFEL. Characterization of the electron beam and the photon beam transport to the instrumentation have been carried out. Given the very first experiments, optimized SASE intensities of 0.8 mJ at 24.58 keV and 0.3 mJ at 30.24 keV, both lasing at the fundamentals, have been simultaneously demonstrated at two hard X-ray beamlines of the facility. These experiments were carried out using optimized low-emittance electron beams based on existing undulators with a 4 cm period and 16.4 GeV electron beam energy. It has also been shown, that the transport of 30 keV photon beams to the user experiments was made possible. The obtained results will be presented. Further discussions on the realization of ultra-hard X-rays using advanced techniques, as well as improved longitudinal beam diagnostics of the facility will be given in detail.  
slides icon Slides MO1L3 [8.172 MB]  
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MO1L4
 The Challenges and Benefits of Increased Application of Permanent Magnets to Future Light Sources  
 
  • J. Chavanne
    ESRF, Grenoble, France
  
  New storage ring based light sources have been recently constructed or are planned with the aim to reduce the horizontal emittance of the electron beam by about two orders of magnitude. It leads to a considerable increase of the brilliance of the photon beams produced at the sources installed around the storage ring. In many cases theses developments correspond to the upgrades of existing third generation facilities. The resulting accelerator lattice is a very compact arrangement of different types of magnets with demanding field properties. In addition, the need to provide energy saving solutions comes as an additional boundary condition. In this context, it looks obvious that Permanent Magnets (PMs) have been and are considered as an interesting alternative to conventional electromagnets. The ESRF Extremely Brilliant Source (EBS) in operation since beginning of 2020 is an example of the successful implantation of PM dipoles. For the majority of ongoing upgrades PMs corresponds to a large fraction of the storage ring magnets. They presently include dipole, quadrupole or combined dipole quadrupole structures. However, for PMs there is a number of specific difficulties to be addressed. These include for example the need to reach the absolute field strength for device which are not tuneable, the thermal stability or the long term stability. These different subjects will be discussed in the light of the EBS experience and the progresses made at several facilities with planned upgrades.  
slides icon Slides MO1L4 [3.932 MB]  
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